NDLI: Evaluation of flitch plate losses in power transformers

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Volume 2 - 1999

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Volume 1 - 1999

Evaluation of flitch plate losses in power transformers

Content Provider	IEEE Xplore Digital Library
Author	Koppikar, D.A. Kulkarni, S.V. Srinivas, P.N. Khaparde, S.A. Jain, R.
Copyright Year	1999
Description	Author affiliation: Transformer Div., Crompton Greaves Ltd., Bombay, India (Koppikar, D.A.; Kulkarni, S.V.; Srinivas, P.N.)
Abstract	Summary form only given as follows. Although eddy current losses in pitch plates of large power transformers may form a small part of total transformer losses, they are important because they can appear concentrated in a small area and cause hazardous hot-spots. An analytical method to calculate pitch plate eddy loss is a very useful practical guide to a transformer designer, but for high power transformers, a more accurate analysis by techniques such as the finite element method (FEM) is desirable. A series of 2-D FEM simulations, using a statistical technique-orthogonal array design of experiments, have been carried out to find the effect of various factors on the losses in a mild steel pitch plate. The procedure for carrying out the experiments and the results obtained thereof are presented. The more involved analysis of slotted pitch plates, has been done using 3-D FEM. Loss and eddy current patterns in mild steel and stainless steel pitch plates have been studied. In both cases, the effect of the number of slots and slot length on the losses is discussed. Effect of slots on eddy current pattern is explained, Results of simulation of laminated pitch plate are presented. The eddy loss distribution obtained by 3-D FEM electromagnetic analysis is used in 3-D FEM thermal analysis to estimate temperature rise of the pitch plate. Verification of 3-D FEM analysis has been done by measurement of temperatures on a slotted mild steel pitch plate of a 33 MVA, single phase, 220/132/11 kV auto-transformer. The estimated temperatures have been found to be in good agreement with that obtained by measurements.
File Size	56542
File Format	PDF
ISBN	0780348931
DOI	10.1109/PESW.1999.747342
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-01-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Power transformers Steel Eddy currents Electromagnetic analysis Temperature measurement Research and development Finite element methods Temperature distribution Phase measurement Electromagnetic measurements
Content Type	Text
Resource Type	Article

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